The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 2009
Filed:
Jan. 23, 2007
Yuuji Shimamoto, Kashihara, JP;
Keizo Arita, Yamatokoriyama, JP;
Kouji Kitahata, Osaka, JP;
Naoki Uchida, Takaishi, JP;
Yuuji Shimamoto, Kashihara, JP;
Keizo Arita, Yamatokoriyama, JP;
Kouji Kitahata, Osaka, JP;
Naoki Uchida, Takaishi, JP;
JTEKT Corporation, Osaka, JP;
Abstract
An electric power steering apparatus is provided with a worm which is a driving gear interlocked with an electric motor for assisting steering, and a worm wheel which is a driven gear having an annular teeth body made of synthetic resin meshing with the worm and a metallic core body coupling the annular teeth body and is attached to the steering shaft. Protrusions are provided on a side surface of the annular teeth body in a face width direction at a plurality of circumferential positions from which a distance to a center of rotation is different from each other, and stirred lubricating fats and oils applied around the worm wheel. As a result, the lubricating fats and oils can be moved to between tooth surfaces of a meshing portion between the worm and worm wheel.